Means for dislodging concrete practice bombs from mold bases



March 8, 1949. s. GRASS! ETAL 2,463,965

MEANS FOR DISLODGING CONCRETE PRACTICE v BOMB MOLD B S Fil 50, 1

' IN V EN TORS Sam/a7" Erass/ By El/o "pp/ ATTORNEY Patented Mar. 8, 1949 MEANS FOR DISLODGING CONCRETE PRAC- TICE BOMBS FROM MOLD BASES Salvatore Grassi and Elio Filippi, San Francisco, Calif.

Application July 30, 1945, Serial No. 607,700

1 Claim. 1

This invention relates to a device or appliance for readily removing a concrete practice bomb from the mold in which the bomb is cast.

The principal object of the invention is the provision of a manually controlled pusher appliance adapted to exert a straight vertical pressure against the bomb to thus push or shove the bomb from the base, for subsequent easy removal of the bomb.

A further object of the invention is the provision of an appliance that is economical to manufacture, positive in operation, strong, durable, and highly efiicient in use.

Other objects and advantages will be apparent during the course of the following description.

In the accompanying drawing forming a part of this specification and in which like numerals are employed to designate like parts throughout the same,

Fig. 1 is a transverse vertical section disclosing to advantage the relationship of the two side molds to the base mold, and the relationship of the permanent core, in which the bomb removing apparatus is positioned, to the base mold, the appliance in this instance being shown in a retracted position, and

Fig. 2 is a cross sectional view of the base mold, with the completed bomb, shown partly in section and partly in elevation, and in this instance illustrating the appliance in operative position.

A concrete practice aerial bomb as now constructed, must be provided with a cavity or recess in the tail end thereof to receive the powder charge. As previously practiced a heavy spun cardboard tube was placed in the base mold and the same was covered with a metal cap. After the bomb was cast the cardboard necessarily bad to be removed. However, this method not only proved to be costly and time consuming, but the serious paper shortage interfered with production. Even though a permanent concrete core was employed that was cast monolithically with the base mold. the use of said core was found to be impracticable because of the difficulty that we experienced in removing the bomb from the base mold after the bomb was cast.

We accordingly discovered that a considerable force would necessarily have to be applied, in opposite directions, to thus free and release the bomb from the base mold. This force we ascertained must be exerted absolutely parallel to the concrete core, which feature is now embodied our pusher device, wherein there is exerted a straight vertical pressure against the bomb. and thus the bomb is shoved out of the base mold so that it can be easily and readily removed.

Referring to the drawing, the numerals 3 and 4 designate two side molds preferably made of light weight concrete while the numeral 5 designates an opening formed in the top of the side molds. It is through this opening that the concrete is poured to cast a bomb 6. It will be noted that a band i or other detachable fastening means serves to secure the side mold-s to the base mold 8, also made of light weight concrete. An interlocking male key 9 provided in the base mold serves to properly locate and retain the side molds rigidly in place. The said mold 8 is equipped with a centrally positioned upwardly extending permanent core II] that is cast monolithically with the base mold 8. It is within this permanent core that the bomb pusher or dislodging appliance is positioned. The said mechanism of the appliance functions to dislodge the bomb 6 from the base mold 8, as illustrated to advantage in Fig. 2. The said mechanism embodies in its construction an elongated metal tube II that is precast in the core and extends from the top of the core to a recess or cavity l2 formed in the bottom of the base mold. A plurality of pins l3 extends radially from said tube and serv to anchor and center the pusher appliance in the concrete core.

Positioned in said tube l I for movement therethrough, is an elongated bolt f4 that is threaded adjacent its upper end as at 15 and is encompassed by a hexagon nut l6 that has threaded engagement with the external thread of the bolt I A. A shoulder is provided on the nut and approximately .030 of an inch allowed for perfect fit. On the top of the bolt We mount a solid metal disc l1, while a head l9 formed on the opposite end of the bolt receives a socket wrench so that the disc I! may be elevated, due to the turning actuation of the bolt, to thus dislodge the bomb from the base mold. A bushing 25! having a pressed fit is likewise positioned in the base of the tube I l. The retracted position of the bolt and the normal location of the bolt head are illustrated to advantage in Fig. 1, while the extended or operative position of the pusher appliance is disclosed to advantage in Fig. 2. It will be obvious that by virtue of the construction described, since a straight vertical pressure is exerted against the bomb, the latter will be readily dislodged from the base mold, for subsequent easy removal.

The type of bomb herein described is provided with fin bolts 2!. and we have illustrated in the drawing a method of receiving and properly locating said bolts.

It is to be understood that the form of our invention herewith shown and described is to be taken as a preferred example of the same and that various changes relative to the shape, size, material and arrangement of parts may be readily resorted to without departing from the spirit of the invention or the scope of the sub- Joined claim.

Having thus described our invention, we claim:

In combination with a bomb forming mold having a perpendicular core in the base thereof, REFERENCES CITED of means for dislodging a molded bomb therefrom comprising a tubular member fixed in and g s g ggf gg are of recmd m the extending through the core, an elongated bolt manually movable through said tubular member, 5 UNITED STATES PATENTS means provided in said tubular member for retalning said bolt in position to direct a straight fifi fgf f vertical pressure against the bomb, a wrench re- 2 049011 gg July 1936 ceiving head provided on one end of said bolt, 224395o Franwick June 1941 and a metal disc carried on the opposite end. 10 2388569 Petersen Nov 1945 SALVATORE GRA SSI. I FOREIGN PATENTS ELIO FILIPPI' Number Country Date 812,011 France Jan. 2'7, 1937 

